Public ReadOnly Property StandardInput As TextWriter

public TextWriter StandardInput {get;}

using (ScriptRunner runner = new ScriptRunner(ScriptEngine.Language.JScript, @"WScript.StdOut.Write(WScript.StdIn.ReadAll());"))
{
    StringWriter sw = new StringWriter();
    runner.OutputReceived += delegate(object o, ProcessOutputEventArgs e) { sw.WriteLine(e.Data); };
    runner.Start();
    runner.StandardInput.WriteLine("From JScript");
    runner.WaitForExit();
    Assert.AreEqual(0, runner.ExitCode);
    Assert.AreEqual("From JScript", sw.ToString().Trim());
}

Using runner As New ScriptRunner(ScriptEngine.Language.JScript, "WScript.StdOut.Write(WScript.StdIn.ReadAll());")
    Dim sw As New StringWriter()
    runner.OutputReceived += Function(o As Object, e As ProcessOutputEventArgs) Do
        sw.WriteLine(e.Data)
    End Function
    runner.Start()
    runner.StandardInput.WriteLine("From JScript")
    runner.WaitForExit()
    Assert.AreEqual(0, runner.ExitCode)
    Assert.AreEqual("From JScript", sw.ToString().Trim())
End Using